<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script>
			var s="aa";
			var s1=new String(true);
			//alert(typeof s1);
			var s2 =String(false);
			//alert(typeof s2);
			//alert(s2.length);
			alert(s.length);
		</script>
	</head>
	<body>
	</body>
</html>
